untreated
adjective
un·treat·ed
ˌən-ˈtrē-təd 
: not treated
untreated wastewater
especially
: not improved or controlled medically
an untreated case of pneumonia
untreated diabetic patients
Examples of untreated in a Sentence
untreated wool
Recent Examples on the Web
If left untreated, infants may experience a progressive, flaccid paralysis that can lead to breathing difficulties and require weeks of hospitalization.
—
James Powel, USA Today, 10 Nov. 2025
The weather service advises motorists to exercise caution if traveling as snow and ice could create slick conditions on untreated surfaces.
—David Ferrara, Cincinnati Enquirer, 10 Nov. 2025
As temperatures drop overnight, untreated roads may become icy, prompting caution for drivers.
—Sirena Bergman, MSNBC Newsweek, 10 Nov. 2025
Left untreated, those pests will weaken and, in the worst case, kill the mandevilla.
—Leanne Potts, Better Homes & Gardens, 10 Nov. 2025
See All Example Sentences for untreated
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James Powel, USA Today, 10 Nov. 2025
The weather service advises motorists to exercise caution if traveling as snow and ice could create slick conditions on untreated surfaces.
—David Ferrara, Cincinnati Enquirer, 10 Nov. 2025
As temperatures drop overnight, untreated roads may become icy, prompting caution for drivers.
—Sirena Bergman, MSNBC Newsweek, 10 Nov. 2025
Left untreated, those pests will weaken and, in the worst case, kill the mandevilla.
—Leanne Potts, Better Homes & Gardens, 10 Nov. 2025
See All Example Sentences for untreated
Cite this Entry
“Untreated.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/untreated. Accessed 17 Nov. 2025.
Copy CitationMedical Definition
untreated
adjective
un·treat·ed
-ˈtrēt-əd
: not subjected to treatment
an untreated disease
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